摘要
本文采用CNT与纳米银颗粒混合球磨的方法,改善了CNT与衬底电极的电学接触性能。并比较了球磨和电泳两种方法分别获得的CNT的场发射特性,结果表明:采用球磨法所获得的CNT场发射阴极的场发射性能远远优于电泳法。在球磨过程中,由于钢球、纳米银颗粒、CNT和衬底之间互相挤压,使CNT和银颗粒及衬底之间形成紧密牢固的接触,减少了界面的接触电阻,从而大大改善了界面的电学接触性能。而电泳沉积的CNT和衬底之间基本上是简单的物理附着力,接触电阻很大,而且由于这种作用力相对较弱,往往会导致发射体本身不稳定。球磨提供了一种改善电学接触的简单有效方法,并且适合于大规模生产CNT场发射冷阴极。
The field emission properties of carbon nanotubes （CNT） of ball milling are much better than that of electrophoresis deposition because fine electrical contact between CNT and substrate and strong adhesion between them were easily obtained by ball milling.CNT roots were embedded into the Ag nano-particles by the speed ball press.CNT roots were fixed on the ITO substrate by Ag nano-particles,and the sticking tips could act as the electron emission resources.CNT attached by electrophoresis alone have the weak adhesion mainly due to the van der Waals＇ force at the interface between CNT and the substrate which resulted in high contact resistance.The ball milling method is short process time,simple apparatus,low cost,and suitable for production of large scale CNT-based field emission cold cathode.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2010年第1期44-47,56,共5页
Journal of Synthetic Crystals
基金
国家自然科学基金(No.90406024
60571004)
关键词
碳纳米管
场发射
球磨
电泳
接触电阻
carbon nanotubes
field emission
ball milling
electrophoresis deposition
contact resistance
